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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2834a71602c2e48a66226e017acadc6719f440318aeeb4d777c600de64f4c319' 
  AND token = 'w5tuRNsOA+s7zi5A4y0E2cIGn8u7IXynU6lRmXZLiqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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