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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2867f44570c8210dcd7c0e22439f6f06a9a7a2d8c04d4a40be6400ffff2ad6d1' 
  AND token = '8W7BzzLMH7LtrzeAhTXN68g4YhOhhe9gNOYVzYEUqdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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