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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4cdca67b8ff220433d54e9ad20a6aa318768df8c0218f4063488bcd430a2a9' 
  AND token = 'RHkAeWS1qPVY3Yw+p/9qz/zs6ufxF0EUySMl3VL8sSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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