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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f018a433f6f8866bdb20bc04170ed228f9bd395436964944e9501c524bf622c' 
  AND token = 'FOMkHrEvab2RrOYtzD3Jdct1mGPfB1ec4FXsw5CcoMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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