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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cdbbefc03b3cba5adc3329cdbcee4d33c9e050ecfadec452f97d85dbcb32f4' 
  AND token = '7WD7Vt1wekNRbWKXpKIUYUotfEZyla2o2VHSIJ7H1lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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