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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620ec7b132dce62b9eb5b6c24e77e2f603b19b908bebbfa2d006430e101cad69' 
  AND token = 'qTqaO5oer+Kcf2Qd6QamrTuBpmEeWSTb598LzLrr0nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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