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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f091fc6bb7829c907fb836d33cfcbbcd5a48e257f334c9c2a58f65eba0f4af8' 
  AND token = '8rumitmk1OJ8Mtq10Y3mUvUXsgUamY+qZj13dWr+Zb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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