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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433b9063dc18b266a16210f5bc5022c089826505e64b43e165d8f80193bf6a21' 
  AND token = 'F1waoILPgj9c+0jh2eMSjkVio6ifWQfOU89LI+IbAcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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