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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98721f2124c623bd191da24610ef67bf1f4d89bda5750ebdf70c9ed39ddf31e' 
  AND token = 'TkdmErwFWls7uaRwOgKsRxa7+/8kC3IkEW4J5kBj49c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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