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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df985a8e2f338a9dbf2b5dcc70c2d28a37f2fbcd83cac116941b3c16dca2790e' 
  AND token = 'FgBB8lolslsSwrVaU163knid0FionOPFQcIqbDf3STM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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