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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faead5a0442078860c1a700dc9ef31b84e60b34915b0a19282ca99d5dcd8825' 
  AND token = 'HCfl5pHM6RKPgFeLTYiHKupHMkvRSYe92vswLfuxa0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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