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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6250179fe393291ba3a0fcd620d2db2456dc49f9030e3680b1f2e995b02e8cb' 
  AND token = 'IgBvgdOR2IjrXKvUx0iU+HWJh3X1AHeEozikppcgiZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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