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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592ef5c7d9b92ba4bea0ed5638c6eaa510238ae696357c4b2843e63f8e5a163c' 
  AND token = '33gsH274MyO+jnJ2qS1+sJk4mzL5M+nxE4f0i+W9OjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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