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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b6f9f4a957549444d20d1ee7d294b759e4bc2784450f4fae6c3d12429f5b0a' 
  AND token = 'T7M3Y+1mCFOt7hInrYTESzX7b1tEa8yH67OPRZNhzIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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