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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6755ab1a9594aea729da106e311aaf0f144c18501a6f6c4c8113db04a893f08a' 
  AND token = 'eupIXrj2R+EVuwLBjH+FL1HA4Hy/zOseanfajBEM4II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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