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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29620c38e84f3e9d8c36b415aed5a37519d7acefef5d8d2be1c0ec4525472d35' 
  AND token = '6C2t4G2J8ojkZfjpy4Miek/D6+MQw1qPf5NC/LW5lkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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