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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb972891d849bc8faaedad8bd934ff99353a45e32e36e6bb836f9263de4c7735' 
  AND token = 'p8j3p61eRNu6lXaoyvWsBRWOjKyWnDel0Y7D/ur8TF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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