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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcbb1e3ebd65a30a5a50154a94363c73ca39a111585420d32979c255711d8b5' 
  AND token = 'wzOPKT5jP+pzKHr5eq9obee3U8LfxpHE15eUlkeqf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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