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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b0e49e6f038cb6cbf85eac6bdb015861fd1413381acd6fbab529af8499bf8c' 
  AND token = 'bDRqqcPeptIkJaWkf3UAU1wbEk0Lt/Gse/t5NmarSu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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