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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad715e44c325db0be2333d576094969c90da628911dacfac06af5b1e05577568' 
  AND token = 'tGEIEl9Y2DI6Rez1U0GJ6AzGAb8VAosWnnC5Ai6f6OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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