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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd988e09e2c4945fe9569e0f7a1a58c5912d9b731101f351c1dbd2af2c929ffe5' 
  AND token = '8tcbwFYWcT63JnhgEN8V5LM/JTIFk3WzEWRWuFvwwIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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