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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec7aa7ccda968aa06ac5df2b089fab45db639b388fb796f7990710666c3f94c' 
  AND token = 'bJ0bVKHJME07Hp8eY13Br1YAMPKfceJu9FTL34OXsR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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