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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec0f8defbe75a2ba2fd2c4c0cd19840302e4859c477b5596ebe75836a4c32f1' 
  AND token = '9Q61/VEOnm5CqsCHRihUB74kF2afzgX2ZlB9NON2L2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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