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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d825c5ce13f69196785f9c5473cc90a4cce92385d5b3de7e30dae9a4ca9055e' 
  AND token = '9yIHPj8QBxvXxTD8SF/jvFgulZviHAM/mKoAjuOOAm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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