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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1911463569fe60e64ff4017bbfd3799bc675242fd1d52b63f8f5100c23b510' 
  AND token = 'Nfq4Oz46DjFALaQLhh70h6630kL7OV6lF/bgnaQXXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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