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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1582e10bda8993376ec7c2b102754530bc5fb91ce702b5816f01ca66c229dbfc' 
  AND token = 'zOfTOH8X9b9u6aI92GdGtd6FwOiwQHjNFnRip9e7v5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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