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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f4f6485af3d38876293862fc9ca7d61cdb6750aa3a7c31e59b3956950c339d' 
  AND token = 'bFKn86XadKEcX1PQiwdwnDaX6jNq6lU8prWWwyLJw7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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