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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce34cfa45ed9f5e1745403c98e9c27f303e26d77f5a7e392c07e31d10cb37e5b' 
  AND token = '4bV93EZDnuw3LBIewxlg6TTXOZ6nEas1pNKrtllnnxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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