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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69526817389ffd2502542323dd0bc022b3999bd40d519301b028d5fbed546912' 
  AND token = 'QlE1b/y4n+TfSwZ0ZW7RGNrWUC593i0/AOUq65El4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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