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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5dfbb8c413afebe55fba67bda8c5b274eee8b1d889f38be9a563efa7734db7' 
  AND token = '+tJ4LggeFzGUhS0CxxoGEQ0yoDcHJeRkitO6ntS1GBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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