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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c46aad698888fca44757191f58b0f481685f1ab12acfa5fb6008c8c7236b4a' 
  AND token = 'oIeINGqZPHl2evTm4xY4wSjKbBGDVnhsuotDyXNP034=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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