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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799367b4162b95c12a94564b6f6727b9c75750d570bce3c1cf699a00bdefa7fb' 
  AND token = 'iwguws64JTI5QdBSR9LgvEEmRI6osAw4YckcsUFDYXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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