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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873f8e8e9d35145b84527ef6eae0e477837d06a61d433db24fc98a36281d72c3' 
  AND token = 'IlNoTAc7rtOSaNCwxLGG+heMgK2Ge7Q1ZFEBdH3AbvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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