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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36614c43524ce86ce35dad54d5892db35baca29cbaad05feccf1469d997d96fe' 
  AND token = '76qx4T5WEqtlX/FNezFej9kk6/tfyKc0L6gVAwfOgNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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