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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f101a46372b12162061038dd9bb70695e7ba5e4c151eb7ddb9b56d766fefba' 
  AND token = 'xQIcs6Mg2SlUQaCRtrEl2xJr3qiQKQx5Ve5vAoY966k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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