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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc6e6e7e89e4240715e932ead13affaff038ed67740946b8e7ddfbdcb44da77' 
  AND token = '/EL+1xkG8Dzu1U5DtVo+nPIm8NW9oMXxGOe03TMrdqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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