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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943ed1bc897d29d7afd07f3685fe6ef2c6e59141fc9a91ea088bfd237f6c8cad' 
  AND token = 'FrOklK3MgQiYzW7sDg2slaEKFMFPKhjcPK7RqA/E6O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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