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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c6d66d50fba1b2589e425af413f7b9e96110f237dc9dbcc7b7ec71ef7a173b' 
  AND token = '1D5UVeqWGeEt5XwSZI6O1WtsUWaSCe3C6g5vTNimkRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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