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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93399ddcb8521598c01a7a7003678bceba40072a0c65b581d4b2ab5ff1e43717' 
  AND token = 'CmtyLXOOPDAEQonVzFR7t9r/NpL7jyB8VI9jpIPnWbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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