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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504916649ab8ad1db34ae652f97daa7b97ac0a34c4390c662f1a57548e4b69d8' 
  AND token = 'JAV6lx/J2bV182vUlTJLsUMKEK46NFbG76aew39P+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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