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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bda5a5eb01be3817e2af7b54deabdef1b878fb574cee399ddb805f679fc2f97' 
  AND token = 'mbY/OtFDvXaokviQ+kTMg/DAnhI8JUOdxiuRKZ21O+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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