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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c671db677e66c0f65ac35f0518e3f718208d8a1a9d0b9f3dbe8b06dfcb632c' 
  AND token = 'pCU6C/8YXJF96Qi5008lV3kybKCdQGcqiJnh+WDmjgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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