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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1246c14cd3db809bdd2913704dfd12c1194e6a3a8006283424cab786b5c9f4d1' 
  AND token = '883p8vDdy6OcmCNQFpEjLQUnG1RRDUT2tA4nX5z12H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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