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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdf9bad07efc9db272ef5e00a65adcbe56487311b427a4846049c78015ce619' 
  AND token = 'PlWYn5HvAva1ACFVFcC7KD97sQZPRCBLqRYxnct6VrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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