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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2053b05cfab0aada2ef02def99bbc3ece1259105ad05205b6c97912d722580' 
  AND token = 'M1tkuR5J59LajsBskTz/at3e0adppM341zgCi3ABDfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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