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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43730fbad122c62fc7e7295f6017de311087a86a8e7cb5b3957854f1b95a55a2' 
  AND token = 'OkYeRuisrRNGDqgPNoFPPUQN3UUP1ogfhIEpb7RgmJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}