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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f70cc8e2d0474a6d3eb929af0c19e14109f0c099db57d55a4f3d3230fc8b75' 
  AND token = 'WrK1iOcfd7J9IROedoaOtnF1LD1DkvkTG4vwLpW2G44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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