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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f255a26e4a70cf51f195c52e89f311f9ee11fd0ac82f9e67f832f904fbfb86' 
  AND token = '88eXx1YWp1xIgOuxOgCaCaZSxu4PY0+JpZMeGg7QV2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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