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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cb74916b793ddf0cd280ba6ea036f66a11d9cf7f88ec9bf441b643b85dad62' 
  AND token = 'eIIsIESBcKjUSsDRi5FiULpwmmMFJtp7w994uep6r7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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