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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5413b6f8f4e2d8da5a4ce296b4b98211328eba2737364b707fcf5b116d373f86' 
  AND token = 'TkeG/Mls2uOUMbn+GgkWdIzemZjtMgEpj/fAAmY2xfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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