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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d59454eb329505bc5da0e2fd31a03389d0ac6eae65657e1293849943f3c787' 
  AND token = 'ApBbAJMNg+s4mhGzWsH/odOVzk7ej0W8WUXPzwNW3Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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