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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea4a52362b6798513a0345634e95a50893a7b9ef40170bb609f5393663953dc' 
  AND token = '44y4hCQxCS/1MdgFsX4w+TXMRB7gJUMeOdVxssr6QXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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