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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa66dc8bc2f37e35225bc1d1bf124fbf7814cef6c95c1b4522c5f5a41c0fffe4' 
  AND token = 'dIaxLg6MetUl8me2u7y42mM6LdVG9lRumn3VMabrW+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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