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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4868be6b71abcaff1fe36988de8ee01e87ef3b55f367878c1be047a682b80a76' 
  AND token = 'w5ARP0KjYXzvaSjKmQkgoUZ/tsZPTLOK6zllLHcaWS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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