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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a1f01044a8a73d1524639aa4fafb79d3de394274895225b08520d16b0807e6' 
  AND token = '3EO2OSSqwMqpbMjTT/9HrJ940ukHlqT6mIJML3w5LVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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