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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91121a0d95b82a78118cb2ee0d1c312a68ce4d310e0135d5ab862182b2a0871e' 
  AND token = 'GnY0RuYf6aszffit0Zasn1QIZsahZINyytqho4SxeEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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