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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a68641cc2c2b598e87dd197386145844f8a2c16f2dcf614f90ab1c271624b2' 
  AND token = 'UALrLnY44wQjPCeeu9Dvb5M7Odl03vnH8IMVk5Cqo5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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